For the grass plant – if you only had one thing you could provide for the whole year – besides water and fertilizer – it should be aeration. After a wet spring and heavy foot traffic the compactions is severe and introducing air into the root zone by removing a soil core makes it possible to go for another season. It is like giving the turf a jump start. The aeration has given the roots the oxygen they need to thrive. By aerating as early as practical in the Spring you are giving the turf the best shot at staying playable for the balance of the season.